Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Also my computer went slowly when I created 2 panels. And it crash. Strangely, my computer also didn't went slowly like this before, it used to run very smoothly. And the system told me to disable composite effect for faster. But my ram is 1 GB, I used P4 Intel /i386. I think there is problem with this or may be the update nearly having trouble.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 7883)]

Thread 2 (Thread 0xa95bab90 (LWP 7884)):
#0  0xb8049430 in __kernel_vsyscall ()
#1  0xb65610e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67412ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e47172 in QWaitCondition::wait (this=0x92302e0, mutex=0x92302dc, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7784ac2 in QHostInfoAgent::run (this=0x92302d0) at kernel/qhostinfo.cpp:260
#5  0xb7e46132 in QThreadPrivate::start (arg=0x92302d0) at thread/qthread_unix.cpp:188
#6  0xb655d4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb673249e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb606aa10 (LWP 7883)):
[KCrash Handler]
#6  0xb6ffe8fa in QGraphicsItem::isWidget (this=0x8d3b898) at graphicsview/qgraphicsitem.cpp:1142
#7  0xb7038667 in QGraphicsScene::event (this=0x8d1d380, event=0xbf862ba0) at graphicsview/qgraphicsscene.cpp:3850
#8  0xb69f7d3c in QApplicationPrivate::notify_helper (this=0x8ca4f70, receiver=0x8d1d380, e=0xbf862ba0) at kernel/qapplication.cpp:4056
#9  0xb6a0003e in QApplication::notify (this=0x8c9f1e0, receiver=0x8d1d380, e=0xbf862ba0) at kernel/qapplication.cpp:3603
#10 0xb750885d in KApplication::notify (this=0x8c9f1e0, receiver=0x8d1d380, event=0xbf862ba0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#11 0xb7f3abcb in QCoreApplication::notifyInternal (this=0x8c9f1e0, receiver=0x8d1d380, event=0xbf862ba0) at kernel/qcoreapplication.cpp:610
#12 0xb704aa75 in QGraphicsView::viewportEvent (this=0x950d328, event=0xbf862ba0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 0xb6ea2235 in QAbstractScrollAreaFilter::eventFilter (this=0x94dbdc0, o=0x950c510, e=0xbf862ba0) at widgets/qabstractscrollarea_p.h:100
#14 0xb7f39dea in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8ca4f70, receiver=0x950c510, event=0xbf862ba0) at kernel/qcoreapplication.cpp:726
#15 0xb69f7d1a in QApplicationPrivate::notify_helper (this=0x8ca4f70, receiver=0x950c510, e=0xbf862ba0) at kernel/qapplication.cpp:4052
#16 0xb6a00122 in QApplication::notify (this=0x8c9f1e0, receiver=0x950c510, e=0xbf862ba0) at kernel/qapplication.cpp:4021
#17 0xb750885d in KApplication::notify (this=0x8c9f1e0, receiver=0x950c510, event=0xbf862ba0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#18 0xb7f3abcb in QCoreApplication::notifyInternal (this=0x8c9f1e0, receiver=0x950c510, event=0xbf862ba0) at kernel/qcoreapplication.cpp:610
#19 0xb6a4e44d in QWidget::event (this=0x950d328, event=0xbf862ba0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 0xb6dffa53 in QFrame::event (this=0x950d328, e=0xbf862ba0) at widgets/qframe.cpp:559
#21 0xb6ea072d in QAbstractScrollArea::event (this=0x950d328, e=0xbf862ba0) at widgets/qabstractscrollarea.cpp:918
#22 0xb70476a6 in QGraphicsView::event (this=0x950d328, event=0xbf862ba0) at graphicsview/qgraphicsview.cpp:2840
#23 0xb69f7d3c in QApplicationPrivate::notify_helper (this=0x8ca4f70, receiver=0x950d328, e=0xbf862ba0) at kernel/qapplication.cpp:4056
#24 0xb6a00122 in QApplication::notify (this=0x8c9f1e0, receiver=0x950d328, e=0xbf862ba0) at kernel/qapplication.cpp:4021
#25 0xb750885d in KApplication::notify (this=0x8c9f1e0, receiver=0x950d328, event=0xbf862ba0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#26 0xb7f3abcb in QCoreApplication::notifyInternal (this=0x8c9f1e0, receiver=0x950d328, event=0xbf862ba0) at kernel/qcoreapplication.cpp:610
#27 0xb69fec6b in QApplication::setActiveWindow (act=0x950d328) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#28 0xb6a6e7b5 in QApplication::x11ProcessEvent (this=0x8c9f1e0, event=0xbf8640ec) at kernel/qapplication_x11.cpp:3469
#29 0xb6a9a37a in x11EventSourceDispatch (s=0x8ca99b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0xb65aab88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb65ae0eb in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb65ae268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7f662f8 in QEventDispatcherGlib::processEvents (this=0x8ca4d00, flags={i = -1081720152}) at kernel/qeventdispatcher_glib.cpp:327
#34 0xb6a99a75 in QGuiEventDispatcherGlib::processEvents (this=0x8ca4d00, flags={i = -1081720104}) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb7f391fa in QEventLoop::processEvents (this=0xbf864350, flags={i = -1081720040}) at kernel/qeventloop.cpp:149
#36 0xb7f39642 in QEventLoop::exec (this=0xbf864350, flags={i = -1081719976}) at kernel/qeventloop.cpp:201
#37 0xb7f3bae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0xb69f7bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#39 0xb4bba310 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804e27d in launch (argc=1, _name=0x8c88a1c "/usr/bin/plasma-desktop", args=0x8c88a34 "", cwd=0x0, envc=0, envs=0x8c88a38 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#41 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#42 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#43 0x0804fbca in main (argc=2, argv=0xbf864b44, envp=0xbf864b50) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

Reported using DrKonqi